function externalLinks ( )
{
	if ( !document.getElementsByTagName ) return;
	
	var anchors = document.getElementsByTagName ( "a" );
 	
 	for (var i=0; i<anchors.length; i++)
 	{
		var anchor = anchors[i];
		if ( anchor.getAttribute("href") && anchor.getAttribute("rel") == "ext" )
		{
			anchor.target = "_blank";
		}
	}
}

window.onload = externalLinks;